Noise reducing apparatus

Details Noise reducing apparatus Noise reducing apparatus

1987-11-13

1989-08-22

Fuller, B. R.

Acoustics

Sound-modifying means

Lens

181175, G10K 1106

Patent

active

048587206

ABSTRACT:
A noise reducing apparatus is disclosed, comprising a lens-type hollow body consisting of a plurality of inclined hollow tubular passages. The lens-type hollow body has a plane incident surface and a curved emission surface and the length L.sub.2 of the hollow tubular passage is optimized in accordance with relevant dimensional parameters of setting of the lens-type hollow body in a sound field, to reduce noise from a spot sound source efficiently.

REFERENCES:
patent: 4553629 (1985-11-01), Sternberg
Japanese Patent Application Laid-Open No. 60-85043.
Japanese Patent Application Laid-Open No. 61-18997.

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